Every time I am about to send an email I get this message and I am unable to send an email. Then I have to unblock the mail account as an admin and then send the email.

I also observed that somehow I am getting lots of mailer@deamon as a failure notification mails for unable to send mails to the recipients that I have not even sent. I think there are some spam email going from my account every other day in a bulk and that block my account.

Please help!